Mozilla Firefox (координаты курсора)

function moveHint(word) {
    document.getElementById('xxx').innerHTML = word;
    document.getElementById('xxx').style.left = event.clientX + document.body.scrollLeft;
    document.getElementById('xxx').style.top = event.clientY + document.body.scrollTop;
    document.getElementById('xxx').style.visibility = "visible";
}
function hideHint(){
    document.getElementById('xxx').style.visibility = "hidden";
    document.getElementById('xxx').innerHTML = "";
    document.getElementById('xxx').style.top = 0;
    document.getElementById('xxx').style.left = 0;
}